* {
    padding: 0;
    margin: 0;
}

ul,
li {
    list-style-type: none;
}

/*主体部分*/
#content {
    width: 100%;
    height: 100%;
    /* top: 20%; */
    overflow: hidden;
    position: absolute;
}

.content-wrap {
    position: relative;
}

.content-wrap>li {
    float: left;
    overflow: hidden;
    position: relative;
}

button {
    width: 100px;
    height: 50px;
}

.button {
    position: absolute;
    bottom: 0;
}